@techsio/storefront-data/dist/shared/prefetch-pages-plan.js

Medusa-first storefront data layer built on TanStack Query.

const uniquePages = (pages)=>Array.from(new Set(pages));
const pushPageIfValid = (pages, page, input)=>{
    if (null == page) return;
    if (page < 1 || page > input.totalPages) return;
    pages.push(page);
};
const createSimplePrefetchPagesPlan = (input)=>{
    const pagesToPrefetch = [];
    pushPageIfValid(pagesToPrefetch, 1 !== input.currentPage ? 1 : null, input);
    pushPageIfValid(pagesToPrefetch, input.hasPrevPage ? input.currentPage - 1 : null, input);
    pushPageIfValid(pagesToPrefetch, input.hasPrevPage ? input.currentPage - 2 : null, input);
    pushPageIfValid(pagesToPrefetch, input.hasNextPage ? input.currentPage + 1 : null, input);
    pushPageIfValid(pagesToPrefetch, input.hasNextPage ? input.currentPage + 2 : null, input);
    pushPageIfValid(pagesToPrefetch, input.currentPage !== input.totalPages ? input.totalPages : null, input);
    return {
        immediate: uniquePages(pagesToPrefetch),
        medium: [],
        low: []
    };
};
const createPriorityPrefetchPagesPlan = (input)=>{
    const high = input.hasNextPage ? [
        input.currentPage + 1
    ] : [];
    const medium = input.hasNextPage && input.currentPage + 2 <= input.totalPages ? [
        input.currentPage + 2
    ] : [];
    const lowCandidates = [
        input.hasPrevPage ? input.currentPage - 1 : null,
        1 !== input.currentPage ? 1 : null,
        input.totalPages > 1 && input.currentPage !== input.totalPages ? input.totalPages : null
    ].filter((page)=>null !== page);
    const immediate = uniquePages(high);
    const immediateSet = new Set(immediate);
    const mediumPages = uniquePages(medium).filter((page)=>!immediateSet.has(page));
    const mediumSet = new Set(mediumPages);
    const lowPages = uniquePages(lowCandidates).filter((page)=>!(immediateSet.has(page) || mediumSet.has(page)));
    return {
        immediate,
        medium: mediumPages,
        low: lowPages
    };
};
const createPrefetchPagesPlan = (input)=>{
    const mode = input.mode ?? "priority";
    if ("simple" === mode) return createSimplePrefetchPagesPlan(input);
    return createPriorityPrefetchPagesPlan(input);
};
export { createPrefetchPagesPlan };